0000000000294342

AUTHOR

Quinten A. Akkerman

showing 3 related works from this author

Effects of Oxygen Plasma on the Chemical, Light-Emitting, and Electrical-Transport Properties of Inorganic and Hybrid Lead Bromide Perovskite Nanocry…

2018

We show that oxygen plasma affects in different ways the structural, chemical, optical, and electrical properties of methylammonium and cesium lead bromide nanocrystals. Hybrid organic–inorganic nanocrystals were severely and quickly degraded by oxygen plasma at 50 W. Their photoluminescence was quenched with almost 100% loss of the initial quantum yield, which is linked to decomposition of the nanocrystals. Inorganic nanocrystals were more resistant to oxygen plasma in the same conditions. Despite a moderate loss of photoluminescence and electrical conductivity, oxygen plasma had a positive impact, removing unbound ligands and resulting in more ohmic behavior of the film. This paves the wa…

PhotoluminescenceMaterials scienceNanotecnologiaQuantum yield02 engineering and technologyPlasmaConductivitat elèctricaConductivity010402 general chemistry021001 nanoscience & nanotechnology7. Clean energy01 natural sciences0104 chemical sciencesNanocrystalChemical engineeringElectrical resistivity and conductivityGeneral Materials Science0210 nano-technologyOhmic contactMaterialsPerovskite (structure)ACS Applied Nano Materials
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In situ transmission electron microscopy study of electron beam-induced transformations in colloidal cesium lead halide perovskite nanocrystals

2017

An increasing number of studies have recently reported the rapid degradation of hybrid and all-inorganic lead halide perovskite nanocrystals under electron beam irradiation in the transmission electron microscope, with the formation of nanometer size, high contrast particles. The nature of these nanoparticles and the involved transformations in the perovskite nanocrystals are still a matter of debate. Herein, we have studied the effects of high energy (80/200 keV) electron irradiation on colloidal cesium lead bromide (CsPbBr3) nanocrystals with different shapes and sizes, especially 3 nm thick nanosheets, a morphology that facilitated the analysis of the various ongoing processes. Our resul…

cesium lead halide nanocrystalsMaterials scienceInorganic chemistryGeneral Physics and AstronomyHalideNanoparticleElectrons02 engineering and technologyElectron010402 general chemistryPhotochemistry01 natural sciencesArticleColloidElectron beam processingGeneral Materials SciencePerovskite (structure)NanotecnologiaGeneral Engineering021001 nanoscience & nanotechnology0104 chemical sciencesNanocrystalTransmission electron microscopyradiation damageTEM0210 nano-technology
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Molecular Iodine for a General Synthesis of Binary and Ternary Inorganic and Hybrid Organic-inorganic Iodide Nanocrystals

2018

We report the synthesis of various binary and ternary inorganic and hybrid organic–inorganic iodide nanocrystals (NCs) starting from molecular iodine (I2). The synthesis described herein utilizes a reaction between I2 and oleylamine, which results in oleylammonium iodide, an iodide precursor that can be directly used in the preparation of iodide-based NCs. The generality of the synthesis was demonstrated by synthesizing KI, RbI, CsI, AgI, CsPbI3, FAPbI3, Cs4PbI6, Cs3Bi2I9, FA3Bi2I9, and RbAg4I5 NCs. Furthermore, the syntheses are facile and are carried out in vials heated on a hot plate in air. They exhibit not only narrow size distributions, but also, in the case of lead-based perovskites …

chemistry.chemical_classificationMaterials sciencePhotoluminescenceInfraredNanotecnologiaGeneral Chemical EngineeringInorganic chemistryIodidechemistry.chemical_element02 engineering and technologyGeneral Chemistry010402 general chemistry021001 nanoscience & nanotechnologyIodine01 natural sciences0104 chemical scienceschemistry.chemical_compoundchemistryNanocrystalOleylamineMaterials Chemistry0210 nano-technologyTernary operationMaterialsPerovskite (structure)
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